There's xenserver (tools) which was opensourced a little while ago. Most configuration management systems also have modules for managing xen. At the moment I'm

There's xenserver (tools) which was opensourced a little while ago. Most configuration management systems also have modules for managing xen. At the moment I'm writing some CFM code using saltstack with the xapi and virt for my own stuff, as I'm not a huge fan of the xenserver and xen cloud platform abstractions.